Here looking south from the north rim overlook, much of the basic geology
of this pit can be observed. Most of the west wall of the pit is fairly
light colored rock and is a granite in composition. Below the main haulage
road on the west wall, the light granite interfingers, at a variety of scales,
with the dark gray country rock into which the granite was intruded. This
rock is variably metmorphosed. The south end of the pit has another haulage
road (which was mined the day after this panorama was made) and preserves
the true dip on the intrusive granite dikes that dip steeply westward. The
geology of the east wall of the pit is very indistinct due to the lighting
and the fact that the geology dips westward at approximately the same angle
as the pit wall.

Especially on the top of the west wall of the pit but actually present
everywhere, is a very noticeable weathering horizon which varies in color
from red to gray-brown. This feature is even more pronounced when looking
north from the south end of the pit. This deep weathering is very common
in the Western Australia desert and must be dealt with in any geochemical
or geophysical exploration program targeting ore deposits at depth. See
the section on weathering for more details.